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Finding the Fourth Proportional to 816.19, 1,224.39 and 322.63

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Solution

The fourth proportional to 816.19, 1,224.39 and 322.63 is: 483.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.19 : 1,224.39 = 322.63 : x
  2. Step 2: Convert to fraction form
    816.19/1,224.39 = 322.63/x
  3. Step 3: Cross multiply
    816.19x = 1,224.39 × 322.63
  4. Step 4: Simplify right side
    816.19x = 395,024.95
  5. Step 5: Solve for x
    x = 395,024.95/816.19
  6. Step 6: Final answer
    x = 483.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.